Concentrator.



No. 649,275. Patented May 8, I900.

- E. r. DAVIS.

CONGENTBATOB.

(Application filed Nov. '10, 1899.)

(No Model.)

, I //v VENTOR A TTOHNEYS- THE scams PETERS ca, PHOTO-UTHO.. wuumamm no- UNITED STATES PATE T. OFFICE.

THIRDS o IRA RYAN PORTER SAME PLACE.

AND EMMET EDGAR JENNINGS, OF

CONCE-NTRATOR. I

SPECIFICATION forming part of Letters Patent No. 649,275, dated May 8,1900. Application filed November 10,1899. Serial No. 736,463- (Nomodel.)

To to whom it may concern.-

Be it known that I, EDSON FRANCIS DAVIS, a citizen of the UnitedStates,residingat W'etmore, in the county of Custer and State of 001-. orado,have invented a new and Improved Concentrator, of which the following isa full, clear, and exact description.

The object of the invention is to provide a new and improvedconcentrator which is simple and durable in construction, very effectivein operation, and designed for concentrating ores or for separatingplacer-gold from sand without the use of water.

The invention consists of novel features and parts and combinations ofthe same, as will be fully described hereinafter and then pointed out inthe claims.

A practical embodiment of my invention is represented in theaccompanying drawings, forming a part of this specification, in whichsimilar characters of reference indicate corresponding parts in all theviews.

Figure lisaplan View of the improvement; Fig. 2 is a side elevation ofthe same, and Fig. 3 is a transverse section of the same on the line 3 3in Fig. 2.

The frame A of the concentratoris hung at its forward end on links A,connected with a suitable base A and the rear end of said frame issupported on a crank-arm A attached to a shaft A journaled in suitablebearings on the base A, a handle A being secured to the shaft andadapted to be locked in position on a notched segment A, secured to orforming part of the base A By the operator manipulating the handle A aturning motion can be given to the shaft A, so as to swing the crank-armA up or down to tilt the frame A whenever it is desired to do so.

In the frame A is hung on links B a concentrating-table O, extending inan inclined position from the rear to the front, and which inclinationof the table can be increased or diminished by the operator manipulatingthe handle A as described, to tilt the frame A more or less and in sodoing increase or decrease the inclination of the table (J. On the topof said table 0 are formed riffles, each of which has a part, 0,extending longitudinally from near one end to about the middle of thehopper downward upon the upper edge of the.

table above the longitudinal portions 0 of the riffles, so that when areciprocating motion is given to the table G then the tailings or sandand gravel work down the riffles,while the gold or heavier materialworks along the riffles and up their curved parts O. The tailings,working downward on the table, finally pass into a trough E, connectedwith a suitable conveyer for carrying the tailings to a pump, and on theupper end of the table, at the discharge end of the rifiie parts 0 isarranged a trough F for receiving the gold or heavy material Workingalong the bottom of the riffles when the table 0 is reciprocated, asabove mentioned.

In order to impart the desired motion to the table 0, the rear endthereof is provided at its middle with a bearing G, engaging a shaft orpost G, carried by the frame A, and on the front of said table, directlyopposite the bearing G, is arranged a ring'H,engaged by one end of a rod1, extending longitudinally and fitted to slide in a bearing A", carriedby the base A The outer or free end of the rod I is formed with a curvedoffset 1, adapted to be engaged by the arms J of a shaft J, extendingtransversely and journaled in suitable bearings attached to the base AOn said shaft J is secured a pulley J connected by belt with othermachinery, so that a rotary motion is imparted to the shaft J to causethe arms J to successively engage the end I of the rod I to push thelatter to the left, and thereby impart a swinging motion to the table C,the latter turning on the shaft G as the pivot. The left-hand forwardend of the table 0 is adapted to press against a spring K, held on theframe A, so that when the table receives a swinging motion by the actionof an arm J and the rod I then the spring K is compressed, and when thearm J leaves the end I of the rod I then the compressed spring returnsthe table O to its forward position and against a bumping-block A on theframe A opposite the spring K, so that the table (J is subjected to abumping action.

It is evident that when the material is fed in a dry condition upon theupper end of the table 0 above the riflie part 0 and a reciprocatingmotion isgiven to the table 0, as "de scribed, and said table issubjected during each movement to a bu mping action then the material onthe table is agitated, so that the gold or other heavy particles settlein the bottom of the riffies and work along the same, to be finallydischarged into the trough F, while the tailings, sand, or other lightmaterial work over the riflies, down the inclined table, and finallypass into the trough E-that is, when the table strikes the bumping-block at the right-hand side then the heavy. concentrates arecaused to move to the right, owing to the bumping action, and as theriffles curve to the right and rearward it is evident that theconcentrates travel up the riffies and discharge. From the foregoing itis evident that by the arrangement described the mechanical operation ofthe table insures a thorough and quick separation of the gold from thetailings or sand.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent 1. An ore-concentrator, comprisingatableinclined upwardly from the front to the rear, a vertical pivot to whichthe rear side of the table is attached, means for-imparting a bum pingreciprocal motion to the table, and riffles on said table havingportions extended lengthwise and portions extended transversely in acurved line, substantially as specified.

2. An ore-con centrator, comprising a frame, an inclined table hung insaid frame and pivoted thereon, means for imparting a bu m pingreciprocating motion to said table, a feed-hopper f or discharging thematerial upon the table at the upper end thereof and at one side, andriffles-on said table and extending partly straight in a longitudinaldirection below said feed-hopper and partly curved in an upward andtransverse direction, said straight and curved portions of the riiflesextending on opposite sides of the tables pivot, as set forth.

3. An ore-concentrator,comprisingaframe, an inclined table hung in saidframe and piv-' oted thereon, means for imparting a bumpingreciprocating motion to said table, a feed-hopper for discharging thematerial upon the table at the upper end thereof and at one side,

ri'ffles on said table and extending partly straight ina longitudinaldirection below said feed-hopper and partly curved in an upward andtransverse direction ,a trough on the lower front end of the table, forreceiving the tailings, and a trough on the upper rear end of the tableat the discharge end of the curved parts of the rifiies, for receivingthe gold, substantially as shown and described.

4:. An ore-concentrator,comprising a frame, an inclined table hung insaid frame and pivoted thereon, means for imparting a bumpingreciprocating motion to said table, a feed-hopper for discharging thematerial upon the table at the upper end thereof and at one side,riftles on said table and extending partly straight in a longitudinaldirection below said feed-hopper and partly curved in an upward andtransverse direction and a spring against which abuts one end of thetable, as set forth.

5. An ore-concentrator,comprisingaframe, an inclined table hung in saidframe and pivoted thereon, means for imparting a bumping reciprocatingmotion to said table, afeed-hopper for discharging the material upon thetable at the upper end thereof and at one side, riffles on said tableand extending partly straight in a longitudinal direction below saidfeed-hopper and partly curved in an upward and transverse direction, andmeans, substantially as described, for tilting said frame, as

setforth.

EDSON FRANCIS DAVIS. \Vi tnesses:

(l. D. SHAEFFER, KENT L. Ennnnn.

